Use of compositions containing bisazo compounds for detecting fissures

US6616712B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Karin H. Beck · Ludwigshafen, DE
• Christos Vamvakaris · Kallstadt, DE
• Karl-Heinz Etzbach · Bischofswerda, DE
• Gerhard Scholz · Ludwigshafen, DE
• Claudia Krah · Mutterstadt, DE

Key dates

• Filing date: May 17, 2001
• Grant date: Sep 9, 2003
• Expiry date: May 17, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0083
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Compositions comprising as componentsA) at least one bisazo compound selected from the group consisting of the compounds of the general formula Ia  and of the general formula Ib  where R1 is C1-C8-alkyl, R2 is C2-C8-alkyl, R3 and R3′ are each C2-C21-alkyl in which up to four CH2 groups of the carbon chain may be replaced by oxygen in ether function, R4 is hydrogen or is R3 (independently of R3), R4′ is hydrogen or is R3′ (independently of R3′),B) at least one solvent in which said component A) is soluble, and optionallyC) at least one surface-active substance,are useful as dye penetrants for detecting surface cracks or other defects in workpieces to be tested in this respect.